EXPERIMENTAL STUDY ON MICROBUBBLES AND THEIR APPLICABILITY TO SHIPS FOR SKIN FRICTION REDUCTION
By Y. Kodama, A. Kakugawa, Takahito Takahashi, H. Kawashima. Proceeding of First Symposium on Turbulence and Shear Flow Phenomena, 2000
223 citations recorded by the source corpus.
Microbubble experiments were carried out using a circulating water tunnel specially designed for microbubble experiments. The tunnel has a long test section, which enables measurements on the persistence of the skin friction reduction effect by microbubbles in the streamwise direction. It also has a damp tank, which enables continuous testing of microbubbles. Skin friction was measured using a skin friction sensor, which is a force gauge type of 250 N/m 2 full scale, and skin friction reduction by microbubbles up to 40% was obtained. The local void ratio in the bubble condition was measured by putting a suction tube in the test section, and it was obtained that the local void ratio close to the wall has strong correlation with skin friction reduction. The scale effect and the applicability of microbubbles to full scale ships was discussed, based on experimental results using a long flat plate.
Subfields: Biomedical Engineering, Mechanical Engineering, Ocean Engineering
View Paper: https://www.semanticscholar.org/paper/4990ca1fadf7494cc17b42cd714419a28671ee95
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Citations in the corpus
- Friction Drag Reduction of External Flows with Bubble and Gas Injection (2010, background): “…D R 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1 ≤ U∞ < 6 ms–1 6 ≤ U∞ < 11 ms–1 11 ≤ U∞ ≤ 20 ms–1 Sanders et al. 2006 Madavan et al. 1985a Deutsch et al. 2003 Elbing et al. 2008 Sanders et al. 2006 Channel flow data, Kato et al. 1998 Murai et al. 2007 Kodama et al. 2000 A nn u.”
- Frictional drag reduction by bubble injection (2014, unknown): “…University, N13W8, Sapporo 060-8628, Japan e-mail: murai@eng.hokudai.ac.jp to a hottest generation especially among maritime researchers, energetically challenging to reach a comprehensive understanding of the drag reduction toward practical use (Kodama et al. 2000; Moriguchi and Kato 2002).”
- Bubble friction drag reduction in a high-Reynolds-number flat-plate turbulent boundary layer (2006, methodology): “Legner (1984) used a simple stress model that included density reduction and turbulence modification to explain some BDR observations. Madavan et al. (1985b) modelled the bubbly boundary layer as a homogeneous fluid with spatially varying density and viscosity, and found agreement with the experimen”
- Bubble-induced skin-friction drag reduction and the abrupt transition to air-layer drag reduction (2008, background): “During the first at-sea demonstration (Kodama et al. 2000), no net power saving was observed.”